Table 4.

Radiation dose exposure and screw placement accuracy comparison

	FA group (n = 101)	CTNav group (n = 91)	p
ED (mSv)	1.504 (0.494–4.406)	21.130 (10.840–30.390)	< 0.001
Screw placement Gertzbein–Robbins classification	502	450	< 0.001
A	390 (77.7)	417 (92.7)	< 0.05*
B	72 (14.3)	17 (3.7)	< 0.05*
C	18 (3.6)	12 (2.7)	ns
D	6 (1.2)	4 (0.9)	ns
E	16 (3.2)	0 (0.0)	< 0.05*

Data are expressed as median (range) and count (percentage) as appropriate.

FA, fluoroscopy assisted, CTNav CT-navigation assisted, ED effective dose, mSv milliSievert.

*p values from z-test comparison with Bonferroni correction